The authors report that low percentages of dimethylsulfoxide ( DMSO ) in liquid chromatography solvents lead to a strong enhancement of electrospray ionization of peptides, improving the sensitivity of protein identification in bottom up proteomics by up to tenfold. The method can be easily implemented on any LC-MS/MS system without modification to hardware or software and at no additional cost.

2.28E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

2.04E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.89E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.83E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.62E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.61E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.56E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.55E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.42E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.33E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.32E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.28E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.09E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.07E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.03E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1.02E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

1E2Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

9.72E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

9.13E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

9.05E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.77E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.42E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.38E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.34E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.15E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

8.08E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

7.76E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

7.04E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

6.9E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

6.86E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

6.54E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

6.49E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

6.39E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.98E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.98E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.93E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.88E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.83E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.68E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.55E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.53E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.45E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.21E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.19E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

5.07E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

4.86E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

4.8E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

4.71E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

4.67E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.

4.6E1Parts per MillionThe number of spectral counts (SC) is approximately proportional to the product of the protein concentration and molecular weight (MW), therefore we estimate the fraction of total molecules in parts per million (PPM) by $$PPM_i={SC_i\/MW_i}/∑↙{j=1}↖n {SC_j\/MW_j}$$ where MWi is the molecular weight and SCi is the number of spectral counts for protein i and the summation in the denominator is over all the proteins identified in the experiment for a given tissue and condition.